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(Last Modified On 1/10/2013)
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(Last Modified On 1/10/2013)
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Genus
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ARTHROSTEMA Ruiz & Pav.
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PlaceOfPublication
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Fl. Peruv. & Chil. 4: t. 326. 1802.
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Description
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Flowers 4-merous. Hypanthium obconic to narrowly campanulate, elongate, ribless or obscurely ribbed, glabrous or sparsely glandular-setose. Calyx-tube erect or spreading, persistent; sepals broader than long, rounded, obtuse, or apiculate. Petals obovate, apiculate, caducous. Stamens more or less dimorphic; filaments flat; episepalous anthers linear or oblong, straight or curved, the connective pro- longed below the thecae and bearing a short or elongate, truncate, 2- to 3-toothed or 2-setose, anterior appendage; epipetalous anthers shorter, the connective shorter or not prolonged, bearing a relatively short, 2-toothed or 2-setose, anterior append- age. Ovary 4-celled, usually glabrous at the summit; style elongate, somewhat sigmoid; stigma punctiform. Capsule 4-valved. Seeds flattened, semi-ovoid, cochleate, marked with about 8 longitudinal, sometimes tuberculate ridges, the flat sides smooth above the hilum. Erect or scandent, slender, sparsely branched herbs or shrubs, with 4-angled to 4-winged stems, small, petiolate, lanceolate to ovate, 3- to 5-nerved leaves, and sessile or pediceled, pink to purple flowers in loosely branched cymes.
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Distribution
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About 8 species of tropical America.
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Key
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a. Flowers and capsules sessile or nearly so; anthers nearly isomorphic, the connective very briefly prolonged. - 1. A. ALATUM. aa. Flowers pediceled; connective of the outer series of stamens prolonged 5-7 mm. below the anther. . . 2. A. MACRODESMUM.
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